Hi Moises,

>Does anybody know if they are stored in the memory of PC and can be easily changed by user ?

define "easily"... Is your application printing reports and does the user know VFP? In this case they can use

_VFP.SetVar("gnMaxCount",-1)

as the expression for one of the reports to change the value (obviously they would need to figure out the variable name before). They could use a variety of other means to execute code and change the variable. The question is: Would they know how to do this or where to look?